OpenStack安装CentOS镜像:Device eth0 does not seem to be present, delaying initialization
解决办法：删除 /etc/udev/rules.d/70-persistent-net.rules 后重启机器。70-persistent-net.rules这个文件确定了网卡与MAC地址的绑定，clone之后网卡的MAC地址发生了变化，所以导致系统认为网络设备不存在。
经过这样的处理后eth0还不能正常启动，需要将 /etc/udev/rules.d/70-persistent-net.rules 文件最后的修改"eth1"为"eth0"，然后将/etc/sysconfig/network-scripts/ifcfg-eth0中的MAC地址修改为 /etc/udev/rules.d/70-persistent-net.rules文件中所记录的地址，再重启机器，eth0可以正常启动了。
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